61436531 has 4 divisors (see below), whose sum is σ = 66162432. Its totient is φ = 56710632.

The previous prime is 61436509. The next prime is 61436561. The reversal of 61436531 is 13563416.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61436531 - 2⁶ = 61436467 is a prime.

It is a super-2 number, since 2×61436531² = 7548894682627922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61436494 and 61436503.

It is not an unprimeable number, because it can be changed into a prime (61436561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2362931 + ... + 2362956.

It is an arithmetic number, because the mean of its divisors is an integer number (16540608).

Almost surely, 2^61436531 is an apocalyptic number.

61436531 is a deficient number, since it is larger than the sum of its proper divisors (4725901).

61436531 is a wasteful number, since it uses less digits than its factorization.

61436531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725900.

The product of its digits is 6480, while the sum is 29.

The square root of 61436531 is about 7838.1458904514. The cubic root of 61436531 is about 394.5865052864.

Adding to 61436531 its reverse (13563416), we get a palindrome (74999947).

The spelling of 61436531 in words is "sixty-one million, four hundred thirty-six thousand, five hundred thirty-one".